Dust-separator



(NoMoael.) f I l W. E. ALLINGTON 8U W. H. CURTIS.

DUST SEPARATOR.

No. 888,788. Patented sept; 18, 1888.

Maw

o its outer side at e e', and the central portion, c,

UNITED STATES PATENT OFFICE.

WILLIAM ALLINGTON, OF EAST SAGINAW, AND WILLIAM H. CURTIS, OF JACKSON, MICHIGAN.

DUST-SEPARATOR.

SPECIFICATION forming part of Letters Patent No.389,786, dated September 18, 1888.

Application filed October 5, 1880.

To all whom it may concern,.-

Be it known that we,WILLIAM E. ALLING- TON and WILLIAM H. CURTIS, citizens of the United States, residing, respectively, at East Saginaw, county of Saginaw, and at Jackson, Jackson county, State of Michigan, have invented a new and useful Dust-Separator, of which the following is a specification.

Our invention relates to that class of machines which are used to separate fine dust -from heavier material made in planing-mills, our-mills, and other factories, and eftectually disposing of the same; and the objects of our invention are, first, to construct a dustseparator for separating tine and explosive dust from shavings and other heavy material made in planing-mills, flour-mills, and other factories, and effectually dispose of the same; second, to relieve the exhaust-fans used for conveying said material to shaving vaults or other depositories from back-pressure; and, third, to construct the device in such a manner that it will be tire-proof. These objects we accomplish by the device illustrated in the accompanying drawings, in vwhich-- Y Figure l represents a vertical section of our dust-separator, taken on the line A Aof Fig. 2. Fig. 2 is a cross-section taken on the line B *B of Fig. l.

`Similar letters of reference indicate like parts in both iigures.

In carrying out our invention we-preferably construct the separator in the form of a box or casing, which is made of iron to render it 35 lire-proof, although it maybe constructed in any other convenient form. This box or casing a a a a contains the separating-chamber, which may be circular in cross-sectionor in the form of a convolute pipe, b b2 b3, ending in a central portion, c, which is extended upward in the form of a pipe, 7c. At the point m this pipe is somewhat smaller, and has a smaller pipe, Z, inserted in and extending through a cover on its top, thus forming an annular chamber. At the point m another pipe, a, is connected to convey the light but not explosive dust to the furnace or other depository.

The convolute pipe b b2 ba has openings on Serial No. 215,407. (No model.)

has an opening at c in its bottom end for discharging shavings or other heavy material into the hopper i, which is attached to the bottom side of the box a a a a. The bottom of the separating-chamber is provided with a pipe, d, inserted therein, communicating with the hopperz' and extended a distance up into the chamber, as shown in Fig. 1.

The hopper may be made-in any convenient form. The bottom end is open, but is held 6o normally closedY by a weighted door, j, which opens and deposits the load of shavings or other material into the vault or receptacle below when enough has accumulated to overcome the attached weight, as shown by dotted lines in Fig. 1.

The diameter of the separating-chamber, consisting ofthe convolute pipe b' b2 b, is larger at the bottom than at its top, thus giving a slant to the sides, or it may be constructed 7o with perpendicular Sides. The central portion,

c,is also larger in diameter at its base than the pipe K; but it may also be constructed straight, with no pitch to the sides.

In the operation of the invention the shavings or other material are blown into the separating-chamber or convolute pipe b b2 b3 at the tangentially-arranged opening g, and all the heavy material is carried by centrifugal force and gravitation against the outer and lower 8o portion of the chamber and discharged through the openings @,c, and e2 into the hopper i, and thence'into the vault or other receptacle, as hereinbefore stated. The finer dust or lighter material is carried on into the central portion, 8 5 c,where the air has a circular whirling motion. These lighter portions of the'dust or other maferial are carried by centrifugal force against the sides of the central portion, c, up into the pipe k,where the rotary or whirling 'motion of 9o the air and lighter dust continues until they reach the annular chamber formed by the junction of pipes 7c and Z, where the dust is discharged through pipen into the furnace or other receptacle and the air passed out through 9 5 said pipe Z. It is the still lighter and explosive dust that is carried on through the pipe Z out into the air and floats away,or it may be conducted to any suitable receptacle. The bulk ofthe air thrown by the fan through the Ioo `where their diameters are the greatest.

convolute pipe b b2 b, portion c, and pipe k also escapes at o through the pipe l, thus giving full vent to the fan and etfeetually obviating any back-pressure. However, a portion of the air blown by the fan escapes into the hopper z', along with l[he shavings or heavier 1naterial,th rough the openings c, e,an d e2. This air is drawn back through the pipe d into the central portion, c, and discharged with the other air at o. The draft which draws the air back through the pipe d is produced by the circular whirling upward motion of the air in the central portion,c. This separator is designed to be set on the roof of a vault or receptacle, but can be placed under the roof, il' desired.

It will be seen that centrifugal force and gravitation carry the shavings or other material to the openings e, e', and c2, which are located at the bottom and outside ot the chamber or eonvolute pipe b b2 b and portion c, This is our object in building the separator with the sides slanti ng and larger at the bottom than at the top; but the openings may be extended the full height ofthe sides.

Having thus described our invention, wo claim as new and desire to secure by Letters Patent- 1. Inadust-separator,the combination, with the separating-chamber, consisting of the convolute pipe b' b2 b3 and the central portion, c, formed with downwardly Haring or slantiug sides and the openings e, c', and ci, and provided with the pipe d, of the hopper i, substantially as and for the purpose specified.

2. In adust-separator, the combination, with the separatingchamber formed with downwardly iaring or slanting sides and the openings e, e', and e2, and provided with the pipe d, of the hopper fi, having a normally-closed lower end, substantially as and for the purpose specified.

3. The combination of the iron box or casing a a a a with the separating-chamber, consisting of the eonvolute pipe b b2 b3 and eeutral portion, c, and having the openings c e ez, arranged as described, and the hopper 1?, provided with the weighted door j, substantially as described.

4. In a dustseparator, a separatingehamber having slanting sides, larger at the bottom than at the top, one or more discharge-openings, and a bottom, in combination with a hopper and a pipe, as d, passing through said bottoni and connecting said hopper and chamber, substantial] y as described.

5. In a dust-separator, a separating-chamber provided with a central portion extending upward above the main portion of said chamber in the form ot` a pipe and constituting a passage in which the rotation of the air and very tine dust is continued, and having at its top end and one side, respectively, the air and dust discharge pipes, substantially as described.

6. In a dust-separator, a separating-chamber having a tangential inlet-opening, slanting sides larger at the bottom than at the top, an air-outlet at the top, and one or more dust-discharge openings at the bottom, substantially as described.

7. In a dust-separator, a separating duct or chamber having an air-outlet at its upper end, downwardly Haring or slauting sides, peripheral dustdiseharge openings,and a central air inlet pipe, substantially as described.

WILLIAM E. ALLINGTON. YVILLIAM H. CURTIS.

Witnesses:

F. E. Mooa'n, F. W. KNIGHT. 

